On Huawei router too some/most settings are locked but a simple HTML edit can enable it and I can then save it too.
So things like Wifi channel etc. are locked but here you can just delete the "disabled" HTML attribute, choose what you want and save it.
You should also note that TR069, which is their remote management service (basically a backdoor/RAT on your modem). They can anytime enter your modem settings page and do whatever they want. Like reset what I just did above. I came to know about this after couple weeks of installing and my settings just reset and I had some issues with my extended network which depends on fixed wifi channels.
So I disabled that too by adding dummy ACS URL and saving after enabling those fields since it wasn't just allowing me to uncheck the topmost option and save.